Add support for Vesa BIOS extensions

For option ROMs we can use these extensions to request a particular video
mode. Add a header file which defines the binary interface.

Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/include/vbe.h b/include/vbe.h
new file mode 100644 (file)
index 0000000..d405691
--- /dev/null
+++ b/include/vbe.h
@@ -0,0 +1,103 @@
+/******************************************************************************
+ * Copyright (c) 2004, 2008 IBM Corporation
+ * Copyright (c) 2009 Pattrick Hueper <phueper@hueper.net>
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier:    BSD-2-Clause
+ *
+ * Contributors:
+ *     IBM Corporation - initial implementation
+ *****************************************************************************/
+#ifndef _VBE_H
+#define _VBE_H
+
+/* these structs are for input from and output to OF */
+struct __packed screen_info {
+       u8 display_type;        /* 0=NONE, 1= analog, 2=digital */
+       u16 screen_width;
+       u16 screen_height;
+       /* bytes per line in framebuffer, may be more than screen_width */
+       u16 screen_linebytes;
+       u8 color_depth; /* color depth in bits per pixel */
+       u32 framebuffer_address;
+       u8 edid_block_zero[128];
+};
+
+struct __packed screen_info_input {
+       u8 signature[4];
+       u16 size_reserved;
+       u8 monitor_number;
+       u16 max_screen_width;
+       u8 color_depth;
+};
+
+/* these structs only store the required a subset of the VBE-defined fields */
+struct __packed vbe_info {
+       char signature[4];
+       u16 version;
+       u8 *oem_string_ptr;
+       u32 capabilities;
+       u16 video_mode_list[256];
+       u16 total_memory;
+};
+
+struct __packed vesa_mode_info {
+       u16 mode_attributes;    /* 00 */
+       u8 win_a_attributes;    /* 02 */
+       u8 win_b_attributes;    /* 03 */
+       u16 win_granularity;    /* 04 */
+       u16 win_size;           /* 06 */
+       u16 win_a_segment;      /* 08 */
+       u16 win_b_segment;      /* 0a */
+       u32 win_func_ptr;       /* 0c */
+       u16 bytes_per_scanline; /* 10 */
+       u16 x_resolution;       /* 12 */
+       u16 y_resolution;       /* 14 */
+       u8 x_charsize;          /* 16 */
+       u8 y_charsize;          /* 17 */
+       u8 number_of_planes;    /* 18 */
+       u8 bits_per_pixel;      /* 19 */
+       u8 number_of_banks;     /* 20 */
+       u8 memory_model;        /* 21 */
+       u8 bank_size;           /* 22 */
+       u8 number_of_image_pages; /* 23 */
+       u8 reserved_page;
+       u8 red_mask_size;
+       u8 red_mask_pos;
+       u8 green_mask_size;
+       u8 green_mask_pos;
+       u8 blue_mask_size;
+       u8 blue_mask_pos;
+       u8 reserved_mask_size;
+       u8 reserved_mask_pos;
+       u8 direct_color_mode_info;
+       u32 phys_base_ptr;
+       u32 offscreen_mem_offset;
+       u16 offscreen_mem_size;
+       u8 reserved[206];
+};
+
+struct vbe_mode_info {
+       u16 video_mode;
+       bool valid;
+       union {
+               struct vesa_mode_info vesa;
+               u8 mode_info_block[256];
+       };
+};
+
+struct vbe_ddc_info {
+       u8 port_number; /* i.e. monitor number */
+       u8 edid_transfer_time;
+       u8 ddc_level;
+       u8 edid_block_zero[128];
+};
+
+#define VESA_GET_INFO          0x4f00
+#define VESA_GET_MODE_INFO     0x4f01
+#define VESA_SET_MODE          0x4f02
+
+struct graphic_device;
+int vbe_get_video_info(struct graphic_device *gdev);
+
+#endif